Germanium is a chemical element with
the symbol Ge and it has an atomic number of 32. The
atomic weight of Germanium is 72.63. 
Things you might not know about
Germanium:
- Germanium did not become economically
significant until after 1945, when its properties as a
semiconductor were recognized as being very useful in
electronics.
- The Mars Exploration Rovers and several
satellites use triple junction gallium arsenide on germanium
cells.
- Germanium has gained popularity in recent
years for its reputed ability to improve immune system function in
cancer patients.
See GC2XAY2 - Hydrogen, for an explanation
about this series of caches.